Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f9a94e4aa7c99d…

MALICIOUS

PDF

44.7 KB Created: 2021-05-19 08:53:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 83955aec6d027b26fe2fa1faf20cd83f SHA-1: 8824d450e3520b5a04fdf6a6ca21036561ef0e61 SHA-256: 43f9a94e4aa7c99dc028ba51d0fd4bac44da7e9a789816f3b93d83ad40b54571
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are designed as link farms for game hacks and free currency generators. The primary lure appears to be related to 'Coin Master' and 'Roblox' hacks. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a campaign to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/406889139/hack-free-spin-coin-master-game-hack PDF link annotation
    • http://www.centromedicinasport.com/images/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/free-robux-games_GM431946152.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/coin-master-hackcom-xyz_GM406889139.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/coin-master-gift-link-hack_GM406889139.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/www-roblox-robux_GM431946152.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/coin-master-hack-programmers_GM406889139.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/roblox-free-hair-boy_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b9f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B9F 24808 bytes
SHA-256: 6bafb3de80dd87dab99fedbc079391cf51f8bb72ea25443220ae3af55c613ffc
font_01_sfnt_off0000834e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x834E 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFF 18056 bytes
SHA-256: 6e419222a3f00e097ec5a4796a0d55da2a670d2aa1bcbb1aaa1cf298b26301b5

Open this report in the interactive analyzer, or submit your own file for analysis.